Bristles of a brush



FIG. 1 is an isometric view of bristles of a brush;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a front view thereof.

The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for bristles of a brush, as shown and described. 